HOUSING ASSEM. (compressor) 6N8634 - Caterpillar

Illustration 1 g06006920
CAN Data Link
An abnormal update rate on the proprietary CAN data-link will cause this diagnostic code. An abnormal rate can be caused by the following:
Failed propitiatory CAN data-link
Failed propitiatory CAN data-link device
Incorrectly connected connectorTest Step 1. INSPECT THE HARNESS
Turn off the keyswitch.
Turn off the battery disconnect switch.
Inspect the harness for the following:
Inspect the connectors, pins, and sockets for the following:
Cleanliness
Security
Proper mating
Seal condition
Moisture
Corrosion
Connector allen head screw for the proper torque of 2.25 0.25 N m (20 2 lb in)
Inspect the wires at the connector for the following:
Security
Nicks
AbrasionNote: Take care not to pull the wire out of the connector.
Inspect the harness for the following:
Damage
Abrasion
KinksExpected Result:The harness is in good condition.Results:
OK - The harness is in good condition. Proceed to Test Step 2.
NOT OK - The harness is not in good condition.Repair: Repair or replace the harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE REMAINS
Connect the Cat® ET service tool to the service tool connector.
Turn on the battery disconnect switch.
Turn on the keyswitch.
Check Cat ET for an active CID 0246 - FMI 09 diagnostic code.Expected Result:CID 0246 - FMI 09 is not active.Results:
OK - CID 0246 - FMI 09 is not active.Repair: Reset the system and troubleshoot any active diagnostic codes.STOP
NOT OK - CID 0246 - FMI 09 is active. Proceed to Test Step 3.Test Step 3. CHECK THE HARNESS RESISTANCE
Turn off the keyswitch.
Disconnect the ECM from the harness.
Disconnect Cat ET from the service tool connector.
Disconnect the attachment connector.
Use a jumper wire to short contact C and D together at the attachment connector.
Measure the resistance at the ECM connector between 62 and 63.
Remove the jumper wire.Expected Result:The resistance is low.Results:
OK - The resistance is low. Proceed to Test Step 4.
NOT OK - The resistance is high or open.Repair: Repair or replace the harness.STOPTest Step 4. CHECK THE CAN DATA-LINK FOR A SHORT
On VIMS Application ECM, measure the resistance at the attachment connector between:
Pin 50 and frame ground
Pin 34 and frame groundExpected Result:The resistance should be high or openResults:
OK - The resistance is high or openRepair: Reset the system and troubleshoot any active diagnostic codes. If the original condition still exists, the problem may be in an attached device. See the manual for the device in question.STOP
NOT OK - The data-link is shorted.Repair: Repair or replace the harness.STOP